console.log("load index.js"), wx.onMessage(function(e) {
    var l = wx.getSharedCanvas().getContext("2d");
    l.clearRect(0, 0, 530, 1890), l.fillStyle = "red", l.fillRect(0, 0, 530, 1890), 
    l.font = "26px Arial", l.fillStyle = "red", l.textAlign = "center", l.fillText("加载中...", 265, 350), 
    console.log("onMessage"), console.log(e);
});